#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <cstring>
#include <functional>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <strings.h>

#include "Log.hpp"
#include "Common.hpp"
#include "InetAddr.hpp"

const static int gdefaultsockfd = -1;
// const static std::string gdefaultip = "127.0.0.1"; //表示本地主机
const static uint16_t gdefaultport = 8080; //1024以内的不行
using namespace LogModule;
using func_t = std::function<std::string(const std::string&)>;

class UdpServer
{
public:
    UdpServer(func_t func, uint16_t port = gdefaultport)
        :_sockfd(gdefaultsockfd),
        _addr(port),
        _isrunning(false),
        _func(func)
    {

    }
    //千篇一律
    void InitServer()
    {
        //1.创建socket(文件信息)
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);  //文件中的AF_INET
        if(_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            DIE(SOCKET_ERR);
        }   
        LOG(LogLevel::INFO) << "socket success, sockfd is " << _sockfd;

        //2.填充网络信息，并bind绑定
        //还没有设置进入内核中
        // struct sockaddr_in local;
        // bzero(&local, sizeof(local)); //memset
        // local.sin_family = AF_INET;
        // local.sin_port = ::htons(_port); //要发送给对方，M 即要发到网络中,需要将主机序列转为网络字节序
        // local.sin_addr.s_addr = ::inet_addr(_ip.c_str()); //字符串转成四字节，还要转成网络序列
        // ocal.sin_addr.s_addr = INADDR_ANY; //全0 
       

        //设置进入内核中
        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if(n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            DIE(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }
    void Start()
    {
        _isrunning = true;
        while(true)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, CONV(&peer), &len);
            if(n > 0)
            {
                //需要知道消息内容 && 消息发送者
                // uint16_t clientport = ::ntohs(peer.sin_port);  //客户端的端口号
                // std::string clientip = ::inet_ntoa(peer.sin_addr);  //客户端的IP地址
                // InetAddr cli(peer);
                // inbuffer[n] = 0;
                // std::string clientinfo = cli.Ip() + ":" + std::to_string(cli.Port()) + " # " + inbuffer;
                // LOG(LogLevel::DEBUG) << clientinfo;
                // std::string echo_string = "echo# ";
                // echo_string += inbuffer;

                //把英文单词转化成为中文
                inbuffer[n] = 0;
                std::string result = _func(inbuffer);
                ::sendto(_sockfd, result.c_str(), result.size(), 0, CONV(&peer), sizeof(peer));
            }
        }
        _isrunning = false;
    }
    ~UdpServer()
    {
        if(_sockfd > gdefaultsockfd)
            ::close(_sockfd);
    }
private:
    int _sockfd;
    // uint16_t _port;// 服务器未来的端口号
    InetAddr _addr;
    // // std::string _ip;// 服务器对应的ip   云服务器不需要手动bind ip地址
    bool _isrunning; //服务器运行状态
    func_t _func; //业务（回调方法）
};

#endif